Sleepers are going to make huge blocks! I've seen the ones using smaller pieces of clothing, like little dresses, but nothing as big as a sleeper. It sounds like a real challenge working with the fasteners and the feet. I worked with one sleeper for my grandson. Of course, it was a favorite but the puppy chewed on it and ruined it. That sleeper went into 3 projects, using the applique on the sleeper. One of the biggest pieces went into a bib but the smallest became a book on the shelf of one of those bookshelf wall hangings. Not much left of the sleeper but the memories and I hate throwing the last of it away!